package icom.acm.util;
/**
 * @author shench
 * 随即验证码
 */
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class Verificatio {
	private int width;
	private int height;
	private String sRand;
	private BufferedImage image;
	
	public Verificatio(int w,int h){
		width = w;
		height = h;
	}
	
	//给定范围获得随机颜色
	private Color getRandColor(int fc,int bc){  
        Random random = new Random();  
        if(fc>255) fc=255;  
        if(bc>255) bc=255;  
        int r=fc+random.nextInt(bc-fc);  
        int g=fc+random.nextInt(bc-fc);  
        int b=fc+random.nextInt(bc-fc);  
        return new Color(r,g,b);  
    }
	
	public void build(){
		image = null;
		image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
		// 获取图形上下文  
		Graphics g = image.getGraphics();  
		//生成随机类  
		Random random = new Random();  		  
		// 设定背景色  
		g.setColor(getRandColor(200,250));  
		g.fillRect(0, 0, width, height);  		  
		//设定字体  
		g.setFont(new Font("Times New Roman",Font.PLAIN,18));  		    
		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到  
		g.setColor(getRandColor(160,200));  
		for (int i=0;i<155;i++)  
		{  
		 int x = random.nextInt(width);  
		 int y = random.nextInt(height);  
		 int xl = random.nextInt(12);  
		 int yl = random.nextInt(12);
		 g.drawLine(x,y,x+xl,y+yl);  
		}  		  
		// 取随机产生的认证码(4位数字)  
		sRand="";  
		for (int i=0;i<4;i++){  
		    String rand=String.valueOf(random.nextInt(10));  
		    sRand+=rand;  
		    // 将认证码显示到图象中  
		    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成  
		    g.drawString(rand,13*i+6,16);  
		}		  		 
		// 图象生效  
		g.dispose();	
	}

	public String getSRand() {
		return sRand;
	}

	public void setSRand(String rand) {
		sRand = rand;
	}

	public BufferedImage getImage() {
		return image;
	}

	public void setImage(BufferedImage image) {
		this.image = image;
	}
	
	
}
